The original ext4-lazy patch for Linux kernel version 4.6 is here.
It has since been integrated to the unstable portion of the ext4 patch queue in the Ext4 filesystem tree.
The most up-to-date version can be found here: http://git.kernel.org/cgit/linux/kernel/git/tytso/ext4.git
IterStore is a parameter server library for iterative convergent machine learning applications. Our example applications include matrix factorization, LDA, multi-class logistic regression, and PageRank.
GeePS is a parameter server library that scales single-machine GPU machine learning applications (such as Caffe) to a cluster of machines.